CN108412894A - A kind of novel magnetic fluid bearing and its manufacturing method - Google Patents

A kind of novel magnetic fluid bearing and its manufacturing method Download PDF

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Publication number
CN108412894A
CN108412894A CN201810212379.0A CN201810212379A CN108412894A CN 108412894 A CN108412894 A CN 108412894A CN 201810212379 A CN201810212379 A CN 201810212379A CN 108412894 A CN108412894 A CN 108412894A
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bearing
magnetic fluid
outer ring
inner race
bearing inner
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CN108412894B (en
Inventor
胡瑞
许春霞
刘佐民
张兵
张一兵
燕松山
解芳
卢艳
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Nanchang Institute of Technology
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Nanchang Institute of Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/50—Other types of ball or roller bearings
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/005—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides comprising a particular metallic binder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/16—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on nitrides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/44—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • F16C33/6659—Details of supply of the liquid to the bearing, e.g. passages or nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
    • F16C33/7806—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for spherical roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/52—Alloys based on nickel, e.g. Inconel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/02—Shaping by casting

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The invention discloses a kind of novel magnetic fluid bearings, including bearing inner race, permanent magnet holder, rolling element and the bearing outer ring set gradually from inside to outside；Bearing inner race is set in bearing outer ring, permanent magnet holder is set on the outer wall of bearing inner race, rolling element is set in permanent magnet holder, the both sides of magnetic fluid bearing are additionally provided with bearing seal cover, the upper end of bearing seal cover and the inner wall of bearing outer ring connect, the outer wall of lower end and bearing inner race connects, and closed cavity is formed between the inner wall of bearing seal cover, bearing outer ring and the outer wall of bearing inner race, and magnetic fluid is injected in cavity.In addition, the present invention also provides a kind of manufacturing methods of novel magnetic fluid bearing.The present invention realizes magnetic fluid rolling friction without dry friction, and frictional force is minimum, and high lubricating effect, sealing performance are strong, therefore without impact, steady, noiseless or have minimum sound in rotation, especially suitable for high rotating speed and has the environment of dust.

Description

A kind of novel magnetic fluid bearing and its manufacturing method
Technical field
The invention belongs to technical field of bearings, and in particular to a kind of novel magnetic fluid bearing and its manufacturing method.
Background technology
Magnetic fluid is also known as magnetic liquid, ferrofluid or magnetic liquid, is a kind of novel functional material, it both has liquid Mobility, and the magnetism with solid magnetic material, are the magnetic retention particle, base load liquid and boundary by a diameter of nanometer scale A kind of colloidal liquid for stabilization that face activating agent three mixes.The fluid nonmagnetic attraction in static state, when additional magnetic When field action, magnetism is just shown, just because of this, it just has a wide range of applications in practice, has in theory very high Learning value.
Magnetic retention particle is usually mixed with interfacial agent and base load liquid, and interfacial agent and base load liquid energy keep magnetism solid Keep certain distance to overcome Van der Waals force and magnetic interaction power between body particle, to make magnetic fluid that there is good sliding Property.Due to this property of magnetic fluid, so it is CN2607467Y that can use it as lubricant for sliding bearing, such as notification number Chinese patent disclose a kind of " Sliding Bearing Lubricated with Ferrofluid ", because magnetic fluid is under the influence of a magnetic field in bearing inner sleeve and axis Between form round section joint ring so that be not in dry friction between bearing inner sleeve and axis, and under the magnetic fields of strong magnet, Magnetic fluid will not generate leakage, and extraneous dirt will not be made to enter bearing clearance, therefore more preferable compared to plain bearing its performance, The service life is longer.But the bearing has the defect in some structures, as the n annular permanent magnets of bearing inner sleeve outer ring are By n-1 annular combined formation of spacer ring, magnetic fluid is formd being uniformly distributed between axis and bearing inner sleeve Round section joint ring separately, this can influence the performance of bearing to a certain extent, therefore, it is necessary to develop a kind of new magnetic Fluid bearing, to overcome drawbacks described above.
Invention content
The present invention provides a kind of novel magnetic fluid bearings, solve the n annulars of bearing inner sleeve outer ring in the prior art Permanent magnet is by the n-1 combined formation of annular spacer ring, and magnetic fluid cannot be uniformly distributed between axis and bearing inner sleeve, to one The problem of determining to influence bearing performance in degree.
The first purpose of the invention is to provide a kind of novel magnetic fluid bearings, including the bearing set gradually from inside to outside Inner ring, permanent magnet holder, rolling element and bearing outer ring；The bearing inner race is set in the bearing outer ring, the permanent magnetism Body retainer is set on the outer wall of the bearing inner race, and the rolling element is set in the permanent magnet holder, the magnetic current The both sides of body bearing are additionally provided with bearing seal cover, and the upper end of the bearing seal cover is connect with the inner wall of the bearing outer ring, under End is connect with the outer wall of the bearing inner race, and in the inner wall of the bearing seal cover, the bearing outer ring and the bearing Closed cavity is formed between the outer wall of circle, and magnetic fluid is injected in the cavity.
Preferably, magnetic fluid injector tunnel is radially offered on the bearing outer ring.
Second object of the present invention is to provide a kind of manufacturing method of novel magnetic fluid bearing, specifically according to the following steps Implement：
Step 1, the surface treatment of bearing inner race and bearing outer ring
Step 1.1, original bearing inner race and original bearing outer ring are dipped into deoxidation liquid, then at 20-40 DEG C It is ultrasonically treated 5-10min, is disposed and respectively obtains deoxidation processing bearing inner race and deoxidation processing bearing outer ring；
Wherein, the deoxidation liquid is a concentration of 10% hydrofluoric acid solution and a concentration of 10% salpeter solution according to 1： 1 volume ratio mixes；
Step 1.2, deoxidation processing bearing inner race in step 1.1 and deoxidation processing bearing outer ring are placed in hydrogen furnace In, and 20-30h is kept the temperature at 550-600 DEG C, heat preservation, which finishes, to be respectively obtained outside hydrogenation treatment bearing inner race and hydrogenation treatment bearing Circle；
Step 1.3, by hydrogenation treatment bearing inner race in step 1.2 and hydrogenation treatment bearing outer ring in warding off the special tin pot of tin 2-3s postcoolings are soaked to room temperature, are then washed with water, and are respectively obtained after cleaning and are warded off tin processing bearing inner race and ward off tin processing bearing Outer ring；
Step 1.4, tin processing bearing inner race will be warded off in step 1.3 and wards off tin processing bearing outer ring is packed into centrifugal casting machine In, centrifugal casting then is carried out using the ceramal of melting, is cooled to room temperature after centrifugal casting, is respectively obtained and be coated with The bearing inner race of ceramal layer and bearing outer ring coated with ceramal layer；
Step 2, the preparation of permanent magnet holder
Step 2.1, following raw material is weighed by mass percentage：Ni：55-60%, Co：5-10%, Ag：0.2-0.5%, Ti：0.5-1.0%, Mo：0.3-0.5%, La：0.1-0.2%, Fe surplus；
Step 2.2, each material weighed in step 2.1 is put into ball mill, setting ratio of grinding media to material is 2: 1, after mixing 12h Compression moulding, it is 5g/cm to obtain density3Blank；Blank is placed in vacuum carbon tube furnace, after being sintered 2h at 1000-1200 DEG C Start casting, molding, obtains the permanent magnet holder；
Step 3, the assembling of bearing
It will be outside the bearing inner race coated with ceramal layer that obtained in step 1.4, the bearing coated with ceramal layer Permanent magnet holder, rolling element and the bearing seal cover that circle, step 2.2 obtain routinely assemble by technique, then passes through magnetic current Magnetic fluid is injected to get to the magnetic fluid bearing in body injector tunnel in cavity.
Preferably, the bearing inner race, the bearing outer ring and the rolling element by high-carbon-chromium bearing steel prepare and At.
Preferably, sonification power is 1.5kW/m in the step 1.13, frequency 300kHz.
Preferably, tin kettle temperature is 260-280 DEG C in the step 1.3.
Preferably, the ceramal is grouped as by the group of following parts by weight：25 parts of titanium nitride, 20 parts of aluminium powder, dioxy 10 parts of SiClx, 10 parts of silicon nitride, 4 parts of boron nitride, 2 parts of niobium pentaoxide, 1 part of graphene oxide, 0.5 part of cesium oxide, yttrium oxide 1 Part, 1 part of phosphor resources powder, 0.5 part of cermet couplant.
Preferably, the magnetic fluid is water base ferroso-ferric oxide or oil base ferroso-ferric oxide.
Preferably, the average grain diameter of the ferroso-ferric oxide in the magnetic fluid is less than 5nm, content 10-15%.
The present invention is first handled bearing inner race and bearing outer ring surface, and last layer ceramics are coated after being disposed and are closed Gold, ceramal are used mainly as the antifriction layer of bearing, which has abundant microvoid structure, Neng Gou Minim gap is formed between rolling surface, becomes store oil space and grease channel, is conducive to reduce friction.In addition, ceramal The mechanical property that bearing inner race and bearing outer ring can also be improved keeps its application range more extensive, while ceramal is non-magnetic Property, it can be to avoid the trace magnetic contained in bearing inner race and bearing outer ring material coated in bearing inner race and bearing outer ring surface Influence of the property metal to magnetic fluid.
The present invention is added with a large amount of nickel when preparing permanent magnet holder, and nickel has face-centered cubic lattice, has good Chemical stability, higher hardness and strength.Nickel and cobalt can form α phases or alpha+beta phase solid solution at 1345 DEG C or less, and nickel and silver exist 960 DEG C or less can form α phases or alpha+beta phase solid solution, and the solid solution that nickel and cobalt, nickel and silver are formed has excellent Physical Mechanical Can, acidproof, heat-resisting, high temperature resistant, can make permanent magnet holder be suitable for it is various under the conditions of use.In addition, prepared by the present invention The more traditional magnetic material of the permanent magnet holder that goes out has higher remanent magnetism and lower coercivity, has and magnetizes rapidly, moves back The characteristic of magnetic meets the long-term running needs of magnetic fluid bearing.
The retainer of the present invention is permanent magnet, and magnetic fluid is set in bearing seal cover, bearing outer ring inner wall and bearing In the closed cavity formed between ring outer wall, under the action of permanent magnet, magnetic fluid formation is uniformly distributed in closed cavity The lubricant layer of central column lubricant layer, central column is more preferable than the lubricant effect and sealing effect of round section joint ring separately, so this hair Bright performance is more preferable, longer life expectancy；Since the present invention is also installed with nonmagnetic bearing outside in the outer of permanent magnet, outside bearing Set plays shielding action for permanent magnet, the magnetism of permanent magnet can be made to be greatly enhanced, so can make the lubrication of magnetic fluid Performance, sealing performance and bearing capacity are greatly improved.
Compared with prior art, the beneficial effects of the present invention are：
The present invention realizes magnetic fluid rolling friction without dry friction, and frictional force is minimum, high lubricating effect, sealing performance By force, without impact, steady, noiseless or have minimum sound therefore in rotation, especially suitable for high rotating speed and there is the environment of dust.
Description of the drawings
Fig. 1 is the front view of the novel magnetic fluid bearing of the present invention；
Fig. 2 is the longitudinal sectional view of the novel magnetic fluid bearing of the present invention.
Reference sign：1- bearing inner races, 2- permanent magnet holders, 3- rolling elements, 4- bearing outer rings, 5- bearing seals Lid, 6- magnetic fluids injector tunnel.
Specific implementation mode
In order to enable those skilled in the art to more fully understand, technical scheme of the present invention is practiced, with reference to specific The invention will be further described for embodiment and attached drawing, but illustrated embodiment is not as a limitation of the invention.
The test method of actual conditions is not specified in following embodiments, according to the conventional method of this field and condition into Row, if material used is commercially available without specified otherwise.
Embodiment 1
A kind of novel magnetic fluid bearing, it is specific as shown in Figs. 1-2, including the bearing inner race 1, forever that sets gradually from inside to outside Magnet retainer 2, rolling element 3 and bearing outer ring 4；Bearing inner race 1 is set in bearing outer ring 4, and permanent magnet holder 2 is set to axis On the outer wall for holding inner ring 1, rolling element 3 is set in permanent magnet holder 2, and the both sides of magnetic fluid bearing are additionally provided with bearing seal cover 5, the upper end of bearing seal cover 5 is connect with the inner wall of bearing outer ring 4, and lower end is connect with the outer wall of bearing inner race 1, and bearing seal Closed cavity is formed between the outer wall of lid 5, the inner wall of bearing outer ring 4 and bearing inner race 1, and magnetic fluid is injected in cavity.
Retainer 2 is permanent magnet, and magnetic fluid is set in closed cavity, and under the action of permanent magnet, magnetic fluid is formed The even central column lubricant layer being distributed in closed cavity, greasy property are good.
It is also radial on bearing outer ring 4 to offer magnetic fluid injector tunnel 6, can at any time to the magnetic fluid in closed cavity into Row supplement, it is easy to use.
Embodiment 2
A kind of manufacturing method of novel magnetic fluid bearing, is specifically implemented according to the following steps：
Step 1, the surface treatment of bearing inner race 1 and bearing outer ring 4
Step 1.1, original bearing inner race and original bearing outer ring are dipped into deoxidation liquid, it is then ultrasonic at 20 DEG C Handle 10min, wherein sonification power 1.5kW/m3, frequency 300kHz；It is disposed and respectively obtains deoxidation processing Bearing inner race and deoxidation handle bearing outer ring；
Wherein, deoxidation liquid is a concentration of 10% hydrofluoric acid solution and a concentration of 10% salpeter solution according to 1：1 Volume ratio mixes；
Step 1.2, deoxidation processing bearing inner race in step 1.1 and deoxidation processing bearing outer ring are placed in hydrogen furnace In, and 20h is kept the temperature at 600 DEG C, heat preservation, which finishes, respectively obtains hydrogenation treatment bearing inner race and hydrogenation treatment bearing outer ring；
Step 1.3, it is 260-280 in temperature by hydrogenation treatment bearing inner race in step 1.2 and hydrogenation treatment bearing outer ring DEG C ward off in the special tin pot of tin soak 2-3s postcoolings to room temperature, then wash with water, clean after respectively obtain ward off tin processing bearing Inner ring handles bearing outer ring with tin is warded off；
Step 1.4, tin processing bearing inner race will be warded off in step 1.3 and wards off tin processing bearing outer ring is packed into centrifugal casting machine In, centrifugal casting then is carried out using the ceramal of melting, is cooled to room temperature after centrifugal casting, is respectively obtained and be coated with The bearing inner race 1 of ceramal layer and bearing outer ring 4 coated with ceramal layer；
Wherein, ceramal is grouped as by the group of following parts by weight：25 parts of titanium nitride, 20 parts of aluminium powder, silica 10 Part, 10 parts of silicon nitride, 4 parts of boron nitride, 2 parts of niobium pentaoxide, 1 part of graphene oxide, 0.5 part of cesium oxide, 1 part of yttrium oxide, phosphorus 1 part of Mo-phenolic resin powder, 0.5 part of cermet couplant；
Step 2, the preparation of permanent magnet holder 2
Step 2.1, following raw material is weighed by mass percentage：Ni：55%, Co：10%, Ag：0.5%, Ti：0.5%, Mo：0.3%, La：0.2%, Fe surplus；
Step 2.2, each material weighed in step 2.1 is put into ball mill, setting ratio of grinding media to material is 2: 1, after mixing 12h Compression moulding, it is 5g/cm to obtain density3Blank；Blank is placed in vacuum carbon tube furnace, starts to pour after being sintered 2h at 1000 DEG C Casting, molding, obtain permanent magnet holder 2；
Step 3, the assembling of bearing
The bearing inner race 1 coated with ceramal layer, the bearing outer ring coated with ceramal layer that step 1.4 is obtained 4, permanent magnet holder 2, rolling element 3 and the bearing seal cover 5 that step 2.2 obtains routinely assemble by technique, then passes through magnetic Fluid injecting hole road 6 injects magnetic fluid to get to magnetic fluid bearing in cavity.
Embodiment 3
A kind of manufacturing method of novel magnetic fluid bearing, is specifically implemented according to the following steps：
Step 1, the surface treatment of bearing inner race 1 and bearing outer ring 4
Step 1.1, original bearing inner race and original bearing outer ring are dipped into deoxidation liquid, it is then ultrasonic at 30 DEG C Handle 8min, wherein sonification power 1.5kW/m3, frequency 300kHz；It is disposed and respectively obtains deoxidation processing Bearing inner race and deoxidation handle bearing outer ring；
Wherein, deoxidation liquid is a concentration of 10% hydrofluoric acid solution and a concentration of 10% salpeter solution according to 1：1 Volume ratio mixes；
Step 1.2, deoxidation processing bearing inner race in step 1.1 and deoxidation processing bearing outer ring are placed in hydrogen furnace In, and 25h is kept the temperature at 580 DEG C, heat preservation, which finishes, respectively obtains hydrogenation treatment bearing inner race and hydrogenation treatment bearing outer ring；
Step 1.3, it is 260-280 in temperature by hydrogenation treatment bearing inner race in step 1.2 and hydrogenation treatment bearing outer ring DEG C ward off in the special tin pot of tin soak 2-3s postcoolings to room temperature, then wash with water, clean after respectively obtain ward off tin processing bearing Inner ring handles bearing outer ring with tin is warded off；
Step 1.4, tin processing bearing inner race will be warded off in step 1.3 and wards off tin processing bearing outer ring is packed into centrifugal casting machine In, centrifugal casting then is carried out using the ceramal of melting, is cooled to room temperature after centrifugal casting, is respectively obtained and be coated with The bearing inner race 1 of ceramal layer and bearing outer ring 4 coated with ceramal layer；
Wherein, ceramal is grouped as by the group of following parts by weight：25 parts of titanium nitride, 20 parts of aluminium powder, silica 10 Part, 10 parts of silicon nitride, 4 parts of boron nitride, 2 parts of niobium pentaoxide, 1 part of graphene oxide, 0.5 part of cesium oxide, 1 part of yttrium oxide, phosphorus 1 part of Mo-phenolic resin powder, 0.5 part of cermet couplant；
Step 2, the preparation of permanent magnet holder 2
Step 2.1, following raw material is weighed by mass percentage：Ni：60%, Co：5%, Ag：0.2%, Ti：1.0%, Mo： 0.5%, La：0.1%, Fe surplus；
Step 2.2, each material weighed in step 2.1 is put into ball mill, setting ratio of grinding media to material is 2: 1, after mixing 12h Compression moulding, it is 5g/cm to obtain density3Blank；Blank is placed in vacuum carbon tube furnace, starts to pour after being sintered 2h at 1100 DEG C Casting, molding, obtain permanent magnet holder 2；
Step 3, the assembling of bearing
The bearing inner race 1 coated with ceramal layer, the bearing outer ring coated with ceramal layer that step 1.4 is obtained 4, permanent magnet holder 2, rolling element 3 and the bearing seal cover 5 that step 2.2 obtains routinely assemble by technique, then passes through magnetic Fluid injecting hole road 6 injects magnetic fluid to get to magnetic fluid bearing in cavity.
Embodiment 4
A kind of manufacturing method of novel magnetic fluid bearing, is specifically implemented according to the following steps：
Step 1, the surface treatment of bearing inner race 1 and bearing outer ring 4
Step 1.1, original bearing inner race and original bearing outer ring are dipped into deoxidation liquid, it is then ultrasonic at 40 DEG C Handle 5min, wherein sonification power 1.5kW/m3, frequency 300kHz；It is disposed and respectively obtains deoxidation processing Bearing inner race and deoxidation handle bearing outer ring；
Wherein, deoxidation liquid is a concentration of 10% hydrofluoric acid solution and a concentration of 10% salpeter solution according to 1：1 Volume ratio mixes；
Step 1.2, deoxidation processing bearing inner race in step 1.1 and deoxidation processing bearing outer ring are placed in hydrogen furnace In, and 30h is kept the temperature at 550 DEG C, heat preservation, which finishes, respectively obtains hydrogenation treatment bearing inner race and hydrogenation treatment bearing outer ring；
Step 1.3, it is 260-280 in temperature by hydrogenation treatment bearing inner race in step 1.2 and hydrogenation treatment bearing outer ring DEG C ward off in the special tin pot of tin soak 2-3s postcoolings to room temperature, then wash with water, clean after respectively obtain ward off tin processing bearing Inner ring handles bearing outer ring with tin is warded off；
Step 1.4, tin processing bearing inner race will be warded off in step 1.3 and wards off tin processing bearing outer ring is packed into centrifugal casting machine In, centrifugal casting then is carried out using the ceramal of melting, is cooled to room temperature after centrifugal casting, is respectively obtained and be coated with The bearing inner race 1 of ceramal layer and bearing outer ring 4 coated with ceramal layer；
Wherein, ceramal is grouped as by the group of following parts by weight：25 parts of titanium nitride, 20 parts of aluminium powder, silica 10 Part, 10 parts of silicon nitride, 4 parts of boron nitride, 2 parts of niobium pentaoxide, 1 part of graphene oxide, 0.5 part of cesium oxide, 1 part of yttrium oxide, phosphorus 1 part of Mo-phenolic resin powder, 0.5 part of cermet couplant；
Step 2, the preparation of permanent magnet holder 2
Step 2.1, following raw material is weighed by mass percentage：Ni：58%, Co：8%, Ag：0.3%, Ti：0.8%, Mo： 0.4%, La：0.2%, Fe surplus；
Step 2.2, each material weighed in step 2.1 is put into ball mill, setting ratio of grinding media to material is 2: 1, after mixing 12h Compression moulding, it is 5g/cm to obtain density3Blank；Blank is placed in vacuum carbon tube furnace, starts to pour after being sintered 2h at 1200 DEG C Casting, molding, obtain permanent magnet holder 2；
Step 3, the assembling of bearing
The bearing inner race 1 coated with ceramal layer, the bearing outer ring coated with ceramal layer that step 1.4 is obtained 4, permanent magnet holder 2, rolling element 3 and the bearing seal cover 5 that step 2.2 obtains routinely assemble by technique, then passes through magnetic Fluid injecting hole road 6 injects magnetic fluid to get to magnetic fluid bearing in cavity.
It should be noted that bearing inner race 1, bearing outer ring 4, rolling element 3 are prepared by high-carbon-chromium bearing steel；Magnetic current Body is water base ferroso-ferric oxide or oil base ferroso-ferric oxide, and the average grain diameter of the ferroso-ferric oxide in magnetic fluid is less than 5nm, contains Amount is 10-15%.
Embodiment 2-4 has prepared magnetic fluid bearing of good performance, to being surface-treated in the step 1 of embodiment 2-4 The performance of the bearing outer ring and bearing inner race crossed is tested, to illustrate that the effect of embodiment 2-4, specific experiment the results are shown in Table 1.
The performance test results after 1 bearing outer ring of table and bearing inner race surface treatment
From table 1 it follows that bearing outer ring and bearing inner race surface surface-treated in the step 1 of embodiment 2-4 Have good mechanical property and frictional behaviour, and disclosure satisfy that it is a variety of under the conditions of to the performance requirement of bearing.
The performance of permanent magnet holder to being prepared in the step 2 of embodiment 2-4 is tested, to illustrate embodiment 2- 4 effect, specific experiment the results are shown in Table 2.
The performance test results of 2 permanent magnet holder of table
From Table 2, it can be seen that the permanent magnet holder prepared in the step 2 of embodiment 2-4 has good mechanics Performance and frictional behaviour, and also more common magnetic fluid bearing is high for its Curie temperature, Curie temperature height shows the magnetic current of the present invention The temperature in use of body bearing is high, and service life is long.
Bearing made from embodiment 2-4 is tested for the property, it is obtaining the result is that：The magnetic fluid bearing of the present invention exists In the case of 2000 revs/min, can continuous-stable operate 80 days or more, remanent magnetism is up to 5000GS or more, coercivity 410KA/m, magnetic Energy product 37KJ/m3, density 5.1g/cm3, compressive strength 142.5MPa.
It should be noted that involved in claims of the present invention when numberical range, it is thus understood that each numberical range Any one numerical value can be selected between two endpoints and two endpoints, due to step method and the embodiment 1-4 phases of use Together, it repeats in order to prevent, description of the invention preferred embodiment, once a person skilled in the art knows basic Creative concept, then additional changes and modifications may be made to these embodiments.It is wrapped so the following claims are intended to be interpreted as It includes preferred embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to include these modifications and variations.

Claims (9)

1. a kind of novel magnetic fluid bearing, which is characterized in that including bearing inner race (1), the permanent magnet set gradually from inside to outside Retainer (2), rolling element (3) and bearing outer ring (4)；The bearing inner race (1) is set in the bearing outer ring (4), described Permanent magnet holder (2) is set on the outer wall of the bearing inner race (1), and the rolling element (3) is set to the permanent magnet and keeps On frame (2), the both sides of the magnetic fluid bearing are additionally provided with bearing seal cover (5), the upper end of the bearing seal cover (5) with it is described The inner wall of bearing outer ring (4) connects, and lower end is connect with the outer wall of the bearing inner race (1), and the bearing seal cover (5), institute It states and forms closed cavity between the inner wall of bearing outer ring (4) and the outer wall of the bearing inner race (1), be injected in the cavity Magnetic fluid.
2. novel magnetic fluid bearing according to claim 1, which is characterized in that radially opened up on the bearing outer ring (4) There is magnetic fluid injector tunnel (6).
3. novel magnetic fluid bearing manufacturing method according to claim 1, which is characterized in that specifically real according to the following steps It applies：
Step 1, the surface treatment of bearing inner race (1) and bearing outer ring (4)
Step 1.1, original bearing inner race and original bearing outer ring are dipped into deoxidation liquid, it is then ultrasonic at 20-40 DEG C 5-10min is handled, is disposed and respectively obtains deoxidation processing bearing inner race and deoxidation processing bearing outer ring；
Wherein, the deoxidation liquid is a concentration of 10% hydrofluoric acid solution and a concentration of 10% salpeter solution according to 1：1 Volume ratio mixes；
Step 1.2, deoxidation processing bearing inner race in step 1.1 and deoxidation processing bearing outer ring are placed in hydrogen furnace, and 20-30h is kept the temperature at 550-600 DEG C, heat preservation, which finishes, respectively obtains hydrogenation treatment bearing inner race and hydrogenation treatment bearing outer ring；
Step 1.3, hydrogenation treatment bearing inner race in step 1.2 and hydrogenation treatment bearing outer ring are soaked into 2- in warding off the special tin pot of tin Then 3s postcoolings are washed with water to room temperature, respectively obtained after cleaning and ward off tin processing bearing inner race and ward off tin processing bearing outer ring；
Step 1.4, tin processing bearing inner race will be warded off in step 1.3 and wards off tin processing bearing outer ring and is fitted into centrifugal casting machine, so Centrifugal casting is carried out using the ceramal of melting afterwards, is cooled to room temperature after centrifugal casting, is respectively obtained coated with ceramics The bearing inner race (1) of alloy-layer and the bearing outer ring (4) coated with ceramal layer；
Step 2, the preparation of permanent magnet holder (2)
Step 2.1, following raw material is weighed by mass percentage：Ni：55-60%, Co：5-10%, Ag：0.2-0.5%, Ti： 0.5-1.0%, Mo：0.3-0.5%, La：0.1-0.2%, Fe surplus；
Step 2.2, each material weighed in step 2.1 is put into ball mill, setting ratio of grinding media to material is 2: 1, is suppressed after mixing 12h Forming, it is 5g/cm to obtain density3Blank；Blank is placed in vacuum carbon tube furnace, at 1000-1200 DEG C be sintered 2h after Casting, molding, obtain the permanent magnet holder (2)；
Step 3, the assembling of bearing
Bearing inner race (1), the bearing outer ring coated with ceramal layer coated with ceramal layer that will be obtained in step 1.4 (4), permanent magnet holder (2), rolling element (3) and the bearing seal cover (5) that step 2.2 obtains routinely assemble by technique, so Afterwards by magnetic fluid injector tunnel (6) in the cavity injection magnetic fluid to get to the magnetic fluid bearing.
4. the manufacturing method of novel magnetic fluid bearing according to claim 3, which is characterized in that the bearing inner race (1), The bearing outer ring (4) and the rolling element (3) are prepared by high-carbon-chromium bearing steel.
5. the manufacturing method of novel magnetic fluid bearing according to claim 3, which is characterized in that surpass in the step 1.1 Sonication power is 1.5kW/m3, frequency 300kHz.
6. the manufacturing method of novel magnetic fluid bearing according to claim 3, which is characterized in that warded off in the step 1.3 The special tin kettle temperature of tin is 260-280 DEG C.
7. the manufacturing method of novel magnetic fluid bearing according to claim 3, which is characterized in that the ceramal by with The group of lower parts by weight is grouped as：25 parts of titanium nitride, 20 parts of aluminium powder, 0 part of silica 1,10 parts of silicon nitride, 4 parts of boron nitride, five Aoxidize 2 parts of two niobium, 1 part of graphene oxide, 0.5 part of cesium oxide, 1 part of yttrium oxide, 1 part of phosphor resources powder, ceramal 0.5 part of couplant.
8. the manufacturing method of novel magnetic fluid bearing according to claim 3, which is characterized in that the magnetic fluid is water base Ferroso-ferric oxide or oil base ferroso-ferric oxide.
9. the manufacturing method of novel magnetic fluid bearing according to claim 8, which is characterized in that four in the magnetic fluid The average grain diameter of Fe 3 O is less than 5nm, content 10-15%.
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